Length of the two parallel sides of a trapezium is 8.5 cm and 11.5 cm respectively and its height is 4.2 cm, find its area.

We know that,

Given that length of 2 parallel sides = 8.5cm and 11.5cm

⇒sum of parallel sides = 8.5 + 11.5 = 20

And, distance between them = 4.2cm

= 42 sq cm